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. 2022 Mar 18;9:862572. doi: 10.3389/fvets.2022.862572

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Copyright © 2022 Han, Cui, Shen, Li, Ren, Bungo, Chowdhury, Li and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effects of L-leucine (L-Leu) in ovo feeding on serum isoleucine (A), ammonia (B), and threonine (C) in male broiler chickens after 1 week of recovery at 46 days of age. The number of chickens in each group was n = 6. *P < 0.05.